x86: fix early_ioremap pagetable ops

Some important parts of f6df72e71eba621b2f5c49b3a763116fac748f6e got
dropped along the way, reintroduce them.

Only affects paravirt guests.

Signed-off-by: Ian Campbell <[e-mail]>
Signed-off-by: Ingo Molnar <[e-mail]>
Signed-off-by: Thomas Gleixner <[e-mail]>

arch/x86/mm/ioremap.c

···
 
 	pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN));
 	memset(bm_pte, 0, sizeof(bm_pte));
-	set_pmd(pmd, __pmd(__pa(bm_pte) | _PAGE_TABLE));
+	pmd_populate_kernel(&init_mm, pmd, bm_pte);
 
 	/*
 	 * The boot-ioremap range spans multiple pmds, for which
···
 
 	pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN));
 	pmd_clear(pmd);
-	paravirt_release_pt(__pa(pmd) >> PAGE_SHIFT);
+	paravirt_release_pt(__pa(bm_pte) >> PAGE_SHIFT);
 	__flush_tlb_all();
 }